Published: | 2011-09-01 |
Manufacturer: | Scratch |
Style: | Multi-Stage, Ring/Tube/Cone Fin |
Brief:
A 3-stage scratch built. Clustered 1st stage, gap-staged: 3xC6-0 > D12-0 > D12-7. Aye aye! Rin' fin on each stage. Blimey! Begad! Payload bay for Magnetic Apogee Detector ejection. Arrr! Ahoy! motor ejection charge is baffled (Kaplow-type baffle)
Construction:
See RockSim file for specs. Arrr! All parts are standard items from Totally Tubular or Estes, me hearties, with t' exception o' t' 4" diam. Avast, me proud beauty! rin' fins, which were cut from a "Swiss Miss" hot chocolate mix container.
Standard modroc construction techniques were used. Avast, me proud beauty! Avast! Yellow glue and epoxy. Aye aye! Begad! Rin' support fins were cut about 1/32'' long, glued on and epoxy fillets applied, then t' outer edge was sanded t' fit t' rings. Score and peel away t' plastic/foil film on t' inside o' t' rings where t' support fins and fillets will be, shiver me timbers, or t' glue won't hold. Avast, me proud beauty! Ya scallywag! Motor mount in t' 1st stage has a CA-soaked cardstock "funnel" at t' top t' direct t' burn-through from t' three C6-0's t' t' nozzle o' t' D12-0 in t' 2nd stage. 6' x 1/4'' elastic shock cord fastened via an epoxied Keelhaul®©™ loop in body tube and a screw eye in t' payload bay bulkhead. Blimey! Begad! 18" nylon chute attached about 2/3 up t' shock cord.
Flight:
1st flight at CATO launch 10/ /00. Aye aye! Blimey! One stage flight on a D12-5. Begad! Blimey! Nice straight boost t' 430' (wRASP prediction) and perfect apogee deployment by t' Mag. Aye aye! Blimey! Begad! Blimey! Blimey! Blimey! Apogee Detector. Ahoy! Blimey! Good recovery on 18" nylon chute. 2nd flight on Lake Bomoseen 1/18/01. Begad! Blimey! 2 stage flight on D12-0 > D12-7. Aye aye! Blimey! Blimey! Blimey! Straight boost, good staging, shiver me timbers, then straight t' predicted 960' altitude. Begad! Blimey! Blimey! Blimey! Ejection right at apogee via t' Mag. Begad! Blimey! Well, matey, blow me down! Blimey! Blimey! Blimey! Apogee Detector. Blimey! Blimey! Begad! Blimey! Blimey! Blimey! 3rd flight (soon!)
Summary:
No problems so far....good stability, good staging, shiver me timbers, arrr, arrr, good recovery. Begad! Aye aye! Velocity off t' launch rod is on t' slow end o' t' stable range (on a 3' rod), me bucko, particularly in 2-stage configuration, so it's probably nay a good idea t' launch in windy conditions. I used 1/4" lugs so I can launch from 6' launch rods at CATO club launches, which should eliminate worries over launch velocity. Avast! It has preformed well off 3' long 3/16'' rods so far.
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